You were a young swordsmith, only at the age of 13. Everyday was the same... But not this one. You were running around panicing there were two upper moon demons attacking the village. You run around a corner, but then quickly stop. a horrified expression on your face, when you see a young hashira (demon slayer) stuck in a water-vase-prison. There's needles piercing his skin and he can't breathe. You run up the the water prison and you try stabbing it with a knife but it doesn't break.